using EVCB_OCPP.Domain;
using EVCB_OCPP.WSServer.Service.DbService;
using EVCB_OCPP.WSServer.Service.WsService;
using Microsoft.Extensions.Logging;

using Quartz;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EVCB_OCPP.WSServer.Jobs;

[DisallowConcurrentExecution]
public class HealthCheckTriggerJob : IJob
{
    public HealthCheckTriggerJob(
        ProtalServer protalServer,
        IMainDbService mainDbService,
        ILogger<HealthCheckTriggerJob> logger)
    {
        this.protalServer = protalServer;
        this.mainDbService = mainDbService;
        this.logger = logger;
    }

    private readonly ProtalServer protalServer;
    private readonly IMainDbService mainDbService;
    private readonly ILogger<HealthCheckTriggerJob> logger;

    public async Task Execute(IJobExecutionContext context)
    {
        //logger.LogDebug("{0} Started", nameof(HealthCheckTriggerJob));

        Dictionary<string, WsClientData> _copyClientDic = protalServer.GetClientDic();

        Dictionary<string, int> chargeBoxHeartBeatIngerval = await GetChargeBoxIdleSeconds(_copyClientDic?.Keys?.ToList());

        var removeClients = _copyClientDic
            .Where(x => x.Value.LastActiveTime < DateTime.UtcNow.AddSeconds(-1 * chargeBoxHeartBeatIngerval[x.Key]))
            .Select(x => x.Value)
            .ToList();

        foreach (var session in removeClients)
        {
            logger.LogDebug("Server forced to shut down ChargeBox ({0}: LastActiveTime{1})", session.ChargeBoxId, session.LastActiveTime);
            protalServer.RemoveClient(session, "Inactive");
        }
        return ;
    }

    private async Task<Dictionary<string, int>> GetChargeBoxIdleSeconds(List<string> chageboxList)
    {
        if (chageboxList is null)
        {
            return new Dictionary<string, int>();
        }

        var getHeartbeatIntervalTasks = chageboxList.Select(async x => (x, await mainDbService.GetMachineHeartbeatInterval(x))).ToList();
        await Task.WhenAll(getHeartbeatIntervalTasks);
        var chargeBoxHeartbeatIntervalIntervalPair = getHeartbeatIntervalTasks.Select(x => x.Result).ToDictionary(x => x.x, x=> x.Item2 );

        Dictionary<string, int> toReturn = new Dictionary<string, int>();
        foreach (var chageboxId in chageboxList)
        {
            //var heartBeatIntervalString = await mainDbService.GetMachineHeartbeatInterval(chageboxId);
            var heartBeatIntervalString = chargeBoxHeartbeatIntervalIntervalPair.Keys.Contains(chageboxId) ? chargeBoxHeartbeatIntervalIntervalPair[chageboxId] : "0";
            int idelSeconds = 300;
            if (int.TryParse(heartBeatIntervalString, out var parsedInterval)
                && parsedInterval * 2 > idelSeconds)
            {
                idelSeconds = parsedInterval * 2;
            }

            toReturn.Add(chageboxId, idelSeconds);
        }
        return toReturn;
    }
}